Effect of pH and nitrite concentration on nitrite oxidation rate

descriptionPublicationkeyboard_double_arrow_right Article 01 Oct 2011 Spain English Publisher:Elsevier BVJournal:Bioresource Technology, volume 102, pages 8,741-8,747 (issn: 0960-8524,

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Authors: Jiménez Douglas, Emérita; Giménez García, Juan Bautista; Ruano García, María Victoria; FERRER, J.; Serralta Sevilla, Joaquín;

doi: 10.1016/j.biortech.2011.07.092

pmid: 21843934

Effect of pH and nitrite concentration on nitrite oxidation rate

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Abstract

The effect of pH and nitrite concentration on the activity of the nitrite oxidizing bacteria (NOB) in an activated sludge reactor has been determined by means of laboratory batch experiments based on respirometric techniques. The bacterial activity was measured at different pH and at different total nitrite concentrations (TNO₂). The experimental results showed that the nitrite oxidation rate (NOR) depends on the TNO₂ concentration independently of the free nitrous acid (FNA) concentration, so FNA cannot be considered as the real substrate for NOB. NOB were strongly affected by low pH values (no activity was detected at pH 6.5) but no inhibition was observed at high pH values (activity was nearly the same for the pH range 7.5-9.95). A kinetic expression for nitrite oxidation process including switch functions to model the effect of TNO₂ concentration and pH inhibition is proposed. Substrate half saturation constant and pH inhibition constants have been obtained.

Country

Spain

Related Organizations

University of Valencia
Spain
Universitat Politècnica de València
Spain

Keywords

Waste component removal, PH range, Unclassified drug, Respirometric technique, Laboratory method, PH, Oxidation rates, PH value, Nitrite, Saturation constant, Batch reactor, PH effect, Oxidation kinetics, Dissociation constant, Nitrobacter, Kinetic expression, Waste Disposal, Fluid, Inhibition constants, Bacterium, Bioreactors, Nitrous acid, Bacterial activity, Reaction kinetics, Bacteria (microorganisms), In Situ Hybridization, Fluorescence, Inhibition, Priority journal, Free nitrous acid, Microscopy, Sewage, Fluorescence in situ hybridization, PH effects, Saturation, Respirometry, Hydrogen-Ion Concentration, Nitrite oxidizing bacteria, Calibration, Oxidation-Reduction, Bioreactor, Parameterization, Activated sludge reactors, Article, Numerical model, Nitrous acid derivative, Reaction rate, Parameter calibration, Batch experiments, Nitrite-oxidizing bacteria, Oxidation, TECNOLOGIA DEL MEDIO AMBIENTE, Nitrites, Experimental study, Bacteria, Concentration (process), Bacteriology, Nitrogen removal, Concentration (composition), Inorganic acids, Microbial activity, Kinetics, Activated sludge, High pH value, Switch function, Concentration (parameters), Oxidation process, Effect of pH, Protein expression, Substrate, Controlled study

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